The use of calcium-based phosphate binders in CKD is associated with which complication?

• A. Increased risk of vascular calcifications
• B. Decreased risk of vascular calcifications
• C. No effect on vascular calcifications
• D. Causes hypercalcemia but not vascular calcifications

Answer: (A)

Calcium-based phosphate binders add calcium to the body. In CKD, phosphate tends to be high and clearance is impaired, so the combination of extra calcium with phosphate circulating in the blood increases the calcium-phosphate product. This elevated Ca x P promotes deposition of calcium-phosphate crystals in vascular walls, leading to vascular calcification. Vascular calcifications contribute to arterial stiffness and higher cardiovascular risk, which is why this binder class is associated with that complication. Other options don’t fit because they either ignore the calcium load contributing to calcification, or imply no effect; while hypercalcemia can occur, the vascular deposition is the clinically important issue linked to calcium-based binders.